"Perhaps we'd better keep on the edge of the crowd," responded Danny Grin. "There is enough to be seen here, for one evening, without entering the Casino."
Though Dave intended to enter the Casino later, he decided, for the present, to take in the full beauty of the night in the gardens. There were electric lights everywhere, which outshone the brilliance of the moon.
"Hello!" whispered Dan, suddenly. "There's an old friend of ours."
"Who?"
"Mr. Green Hat," Dan whispered impressively.
Instantly Dave Darrin became intensely interested, though he had no intimation of what this second meeting portended. That Mr. Green Hat was destined to play a highly tragic rôle in his life, Darrin, of course, had no inkling at that moment.
"There he is!" whispered Dalzell, pointing, as the chums stood screened by a flowering bush.
"We'll watch that rascal!" Dave proposed promptly. "I wonder if he has followed the 'Hudson' here with a view to attempting more mischief against our Government. Whatever his game is, I am going to take a peep at the inside of it if a chance comes my way!"